How to calculate the number of working days between two dates in JavaScript using moment.js. I have a working formula that calculate these days, but the formula does not satisfies all conditions:
here is my code:
var start= moment(data[x].start_date);
var end= moment(data[x].est_end_date);
var difference= end.diff(start, 'days');
var workingDays= Math.round((difference/7)*5);
//data[x] is for iterating over a loop
I get five days per 7 days here because saturday and sunday are considered as NON-Working days, but this formula will fail if the count of the days were started from sunday or saturday.
Please any one could help in this regard that what necessary changes must be done in order to avoid this problem.
Date difference with Moment objects You can also create Moment objects and then calculate the difference: var admission = moment('{date1}', 'DD-MM-YYYY'); var discharge = moment('{date2}', 'DD-MM-YYYY'); discharge. diff(admission, 'days');
Moment JS allows displaying of date as per localization and in human readable format. You can use MomentJS inside a browser using the script method. It is also available with Node. js and can be installed using npm.
js moment(). daysInMonth() Function. The moment(). daysInMonth() function is used to get the number of days in month of a particular month in Node.
Just divide it into 3 parts.. first week, last week and the in between, something like this:
function workday_count(start,end) {
var first = start.clone().endOf('week'); // end of first week
var last = end.clone().startOf('week'); // start of last week
var days = last.diff(first,'days') * 5 / 7; // this will always multiply of 7
var wfirst = first.day() - start.day(); // check first week
if(start.day() == 0) --wfirst; // -1 if start with sunday
var wlast = end.day() - last.day(); // check last week
if(end.day() == 6) --wlast; // -1 if end with saturday
return wfirst + Math.floor(days) + wlast; // get the total
} // ^ EDIT: if days count less than 7 so no decimal point
The test code
var ftest = {date:'2015-02-0',start:1,end:7};
var ltest = {date:'2015-02-2',start:2,end:8};
var f = 'YYYY-MM-DD';
for(var z=ftest.start; z<=ftest.end; ++z) {
var start = moment(ftest.date + z);
for(var y=ltest.start; y<=ltest.end; ++y) {
var end = moment(ltest.date + y);
var wd = workday_count(start,end);
console.log('from: '+start.format(f),'to: '+end.format(f),'is '+wd+' workday(s)');
}
}
Output of test code:
from: 2015-02-01 to: 2015-02-22 is 15 workday(s)
from: 2015-02-01 to: 2015-02-23 is 16 workday(s)
from: 2015-02-01 to: 2015-02-24 is 17 workday(s)
from: 2015-02-01 to: 2015-02-25 is 18 workday(s)
from: 2015-02-01 to: 2015-02-26 is 19 workday(s)
from: 2015-02-01 to: 2015-02-27 is 20 workday(s)
from: 2015-02-01 to: 2015-02-28 is 20 workday(s)
from: 2015-02-02 to: 2015-02-22 is 15 workday(s)
from: 2015-02-02 to: 2015-02-23 is 16 workday(s)
from: 2015-02-02 to: 2015-02-24 is 17 workday(s)
from: 2015-02-02 to: 2015-02-25 is 18 workday(s)
from: 2015-02-02 to: 2015-02-26 is 19 workday(s)
from: 2015-02-02 to: 2015-02-27 is 20 workday(s)
from: 2015-02-02 to: 2015-02-28 is 20 workday(s)
from: 2015-02-03 to: 2015-02-22 is 14 workday(s)
from: 2015-02-03 to: 2015-02-23 is 15 workday(s)
from: 2015-02-03 to: 2015-02-24 is 16 workday(s)
from: 2015-02-03 to: 2015-02-25 is 17 workday(s)
from: 2015-02-03 to: 2015-02-26 is 18 workday(s)
from: 2015-02-03 to: 2015-02-27 is 19 workday(s)
from: 2015-02-03 to: 2015-02-28 is 19 workday(s)
from: 2015-02-04 to: 2015-02-22 is 13 workday(s)
from: 2015-02-04 to: 2015-02-23 is 14 workday(s)
from: 2015-02-04 to: 2015-02-24 is 15 workday(s)
from: 2015-02-04 to: 2015-02-25 is 16 workday(s)
from: 2015-02-04 to: 2015-02-26 is 17 workday(s)
from: 2015-02-04 to: 2015-02-27 is 18 workday(s)
from: 2015-02-04 to: 2015-02-28 is 18 workday(s)
from: 2015-02-05 to: 2015-02-22 is 12 workday(s)
from: 2015-02-05 to: 2015-02-23 is 13 workday(s)
from: 2015-02-05 to: 2015-02-24 is 14 workday(s)
from: 2015-02-05 to: 2015-02-25 is 15 workday(s)
from: 2015-02-05 to: 2015-02-26 is 16 workday(s)
from: 2015-02-05 to: 2015-02-27 is 17 workday(s)
from: 2015-02-05 to: 2015-02-28 is 17 workday(s)
from: 2015-02-06 to: 2015-02-22 is 11 workday(s)
from: 2015-02-06 to: 2015-02-23 is 12 workday(s)
from: 2015-02-06 to: 2015-02-24 is 13 workday(s)
from: 2015-02-06 to: 2015-02-25 is 14 workday(s)
from: 2015-02-06 to: 2015-02-26 is 15 workday(s)
from: 2015-02-06 to: 2015-02-27 is 16 workday(s)
from: 2015-02-06 to: 2015-02-28 is 16 workday(s)
from: 2015-02-07 to: 2015-02-22 is 10 workday(s)
from: 2015-02-07 to: 2015-02-23 is 11 workday(s)
from: 2015-02-07 to: 2015-02-24 is 12 workday(s)
from: 2015-02-07 to: 2015-02-25 is 13 workday(s)
from: 2015-02-07 to: 2015-02-26 is 14 workday(s)
from: 2015-02-07 to: 2015-02-27 is 15 workday(s)
from: 2015-02-07 to: 2015-02-28 is 15 workday(s)
I use a simple function to accomplish that. Maybe is not the most efficient but it works. It doesn't require Moment.js. it's just Javascript.
function getNumWorkDays(startDate, endDate) {
var numWorkDays = 0;
var currentDate = new Date(startDate);
while (currentDate <= endDate) {
// Skips Sunday and Saturday
if (currentDate.getDay() !== 0 && currentDate.getDay() !== 6) {
numWorkDays++;
}
currentDate = currentDate.addDays(1);
}
return numWorkDays;
}
To addDays
, I use the following function:
Date.prototype.addDays = function (days) {
var date = new Date(this.valueOf());
date.setDate(date.getDate() + days);
return date;
};
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